\input zb-basic
\input zb-ioport
\iteman{io-port 05394491}
\itemau{Wright, Andrew K.}
\itemti{On sapphire and type-safe languages.}
\itemso{Commun. ACM 46, No. 4, 120 (2003).}
\itemcc{}
\itemut{}
\itemli{doi:10.1145/641205.641237}
\end